First, I want to thank you for developing and maintaining this tool. We use it heavily in https://github.com/ros2/ros2 .

I've found what looks to be an infinite loop problem in uncrustify with a particular piece of code in our codebase. The original code is here, but the problematic function is:

class AnySubscriptionCallback
{
  template<typename SetT>
#if !defined(RCLCPP_AVOID_DEPRECATIONS_FOR_UNIT_TESTS)
  [[deprecated("use 'void(std::shared_ptr<const MessageT>)' instead")]]
#endif
  void
  set_deprecated(std::function<void(std::shared_ptr<SetT>)> callback)
  {
    callback_variant_ = callback;
  }
};

I'm currently running the following version of uncrustify (built from source today):

$ ./uncrustify --version
Uncrustify_d-0.78.1-138-e312b0e41

For this test, I'm using the default configuration file from this project.

When I run the above, like the following:

./uncrustify -c etc/defaults.cfg /path/to/code/above.cpp

Then uncrustify goes into an infinite loop. If I remove the template argument, it doesn't loop forever. If I remove the deprecation warning, it doesn't loop forever. If I make it a standalone function (not inside the class), it doesn't loop forever.

Going back through uncrustify history, here are some working and failing versions:

• uncrustify-0.72.0 - works
• uncrustify-0.73 - works
• uncrustify-0.74.0 - loops forever
• uncrustify-0.75.1 - loops forever
• uncrustify-0.78.1-138-e312b0e41 - loops forever

I can't attach a debug.txt (as produced by the -p option), since the infinite loop prevents that from being created. Also, setting debug_max_number_of_loops seems to have no effect here, and it loops forever anyway.

I can get some debug information by running:

./uncrustify -c etc/defaults.cfg /path/to/code/above.cpp -L A 2>A.txt

You can find the results of that in https://gist.github.com/clalancette/5cf4a89ebf3d707d7eba82711c46efba .

Please let me know if you need any other information from me.